Secretary of Defense Frank Carlucci, signaling substantial progress in talks with Chinese leaders, said Wednesday he felt assured that China will take a "responsible" approach in future arms sales overseas. Carlucci's comments at a news conference following two days of talks with senior Chinese military and political leaders were the first clear indication that more than a year of U.S. criticism of the sales has had an impact on Beijing. "We are satisfied with our discussions and are certain the Chinese will behave in a responsible way in the future," Carlucci told reporters at the Great Wall Sheraton Hotel. The defense secretary, in China for a six-day visit, described his talks with Chinese leaders as "the best discussions" ever held on Beijing's burgeoning missile sales.